Premium
Die Elektronen‐ und Infrarotspektren von Hydraten und Clathraten des Nickelcyanids
Author(s) -
Ludi A.,
Hügi R.
Publication year - 1968
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19680510213
Subject(s) - chemistry , octahedron , crystallography , infrared spectroscopy , paramagnetism , molecule , diamagnetism , absorption spectroscopy , cyanide , infrared , crystal structure , inorganic chemistry , physics , organic chemistry , quantum mechanics , magnetic field , optics
The infrared and diffuse reflectance spectra in the visible and ultraviolet region of the following compounds have been measured: Ni(CN) 2 , 2 H 2 O, Ni(CN) 2 , 1½ H 2 O, Ni(CN) 2 , NH 3 , ¼ H 2 O, Ni(CN) 2 , NH 3 , R (R = C 6 H 6 , C 6 H 5 NH 2 , C 6 H 5 OH). The structural units of these compounds are shown to be the square planar [NiC 4 ] and the pseudo‐octahedral [NiN 4 L 2 ]‐group (L = H 2 O, NH 3 ) with Ni‐C‐N‐Ni‐bridges. Additional water is present as zeolitic water. The magnetic data give a 1:1 relation of the paramagnetic pseudo‐octahedral to the diamagnetic square planar co‐ordination polyhedra. The nitrogen of the cyanide ion is close to ammonia in the spectrochemical as well as in the nephelauxetic series, the values of Dq and B being ˜1000 and ˜900 cm −1 respectively. The absorption bands of the aromatic molecules in the clathrates are shifted towards lower wave numbers compared to the corresponding solution spectra.